高一数学集合问题
\u9ad8\u4e00\u6570\u5b66\u96c6\u5408\u95ee\u98982\u2208B\uff0c\u8bf4\u660eX2 +aX+a=2\uff0c
B\u771f\u5305\u542b\u4e8eA\uff0c\u8bf4\u660eX2-5X+9=3\uff0c
\u89e3X2-5X+9=3\u5f97x=2\uff0c\u62163\uff0c
x=2\u65f6\uff0c\u89e3X2+aX+a=2\u5f97
a=-2/3,
\u5c06x=2\uff0c a=-2/3\u4ee3\u5165X2 +(a+1)X-3\uff0c \uff08\u9a8c\u8bc1\uff09
\u5f97X2+(a+1)X-3=5/3 \u4e0d\u7b49\u4e8e 1\uff0c
\u6240\u4ee5 x=2 a =-2/3\u662f\u4e00\u7ec4\u89e3\u3002
\u518d\u5c06x=3\u4ee3\u5165X2+aX+a=2\u5f97\uff0c
a=-7/4,
\u5c06x=3, a=-7/4\u4ee3\u5165X2 +(a+1)X-3\uff0c \uff08\u9a8c\u8bc1\uff09
\u5f97X2 +(a+1)X-3=15/4 \u4e0d\u7b49\u4e8e 1\uff0c
\u6240\u4ee5x=3, a = -7/4\u4e5f\u662f\u4e00\u7ec4\u89e3\u3002
\u6545\uff0cx=2 a=-2/3 \u6216 x=3 a=-4/7\u3002
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